In this Act the expressions listed below are defined or otherwise explained by the provisions indicated—
| act and conduct (in Part 5) | section 69 |
| ancillary offence (in Part 5) | |
| —in England and Wales | section 55 |
| —in Northern Ireland | section 62 |
| appropriate judicial officer (in Part 2) | section 26 |
| article | section 1(2) |
| British aircraft, British hovercraft and British ship | section 76 |
| competent court (in Part 2) | section 26 |
| crime against humanity (in Part 5) | section 50(1) |
| delivery order (in Part 2) | section 5(3) |
| detained (in sections 42 to 47) | section 48(1) |
| genocide (in Part 5) | section 50(1) |
| the ICC | section 1(1) |
| ICC crime | section 1(1) |
| the ICC Statute | section 1(1) |
| national court | section 75 |
| person subject to UK service jurisdiction (in Part 5) | section 67(3) |
| the prisoner (in Part 4) | section 42(1) |
| provisional warrant (in Part 2) | section 3(5) |
| remand (in Part 2) | section 16 |
| section 2 warrant (in Part 2) | section 2(5) |
| service court | section 75 |
| United Kingdom national (in Part 5) | section 67(1) |
| United Kingdom resident (in Part 5) | section 67(2) |
| war crime (in Part 5) | section 50(1) |